Setting Font Style with Captions or Lables

I have scoured the Internet as well as the ImageMagick website and have not been able to come up with any concrete instance in which you can set the font style for a label or caption in which a custom font file is being used. The custom font file renders
correctly but Is there a way you can set the font style with a Caption or Label? I am trying to achieve both bold and bold- italic.

I spend all night figuring out how I could get this to work and I am close to a solution. I will have to make some changes for this so it won't be available until the next release. I will get back to this topic when I have more information.